CVE-2016-10147: Null Pointer Dereference
First published: Tue Dec 13 2016(Updated: )
Algorithms not compatible with mcryptd could be spawned by mcryptd with a direct crypto_alloc_tfm invocation using a "mcryptd(alg)" name construct. This causes mcryptd to crash the kernel if an arbitrary "alg" is incompatible and not intended to be used with mcryptd. This could be a potential attack to crash the kernel by user program using AF_ALG to request an invalid algorithm such as mcryptd(md5). Upstream report: <a href="https://marc.info/?l=dm-devel&m=148063708010538&w=2">https://marc.info/?l=dm-devel&m=148063708010538&w=2</a> Suggested Patch: <a href="http://marc.info/?l=linux-crypto-vger&m=148096718218312&w=2">http://marc.info/?l=linux-crypto-vger&m=148096718218312&w=2</a> Upstream patch: <a href="https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd">https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd</a> CVE-ID request and assignment: <a href="http://seclists.org/oss-sec/2017/q1/118">http://seclists.org/oss-sec/2017/q1/118</a> <a href="http://seclists.org/oss-sec/2017/q1/127">http://seclists.org/oss-sec/2017/q1/127</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=4.8.14 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd
- http://marc.info/?l=linux-crypto-vger&m=148063683310477&w=2
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.8.15
- http://www.openwall.com/lists/oss-security/2017/01/17/13
- http://www.securityfocus.com/bid/95677
- https://access.redhat.com/errata/RHSA-2017:1842
- https://access.redhat.com/errata/RHSA-2017:2077
- https://bugzilla.redhat.com/show_bug.cgi?id=1404200
- https://github.com/torvalds/linux/commit/48a992727d82cb7db076fa15d372178743b1f4cd
- http://marc.info/?l=linux-crypto-vger&m=148063683310477&w=2
- https://launchpad.net/bugs/cve/CVE-2016-10147
- https://marc.info/?l=dm-devel&m=148063708010538&w=2
- http://marc.info/?l=linux-crypto-vger&m=148096718218312&w=2
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd
- http://seclists.org/oss-sec/2017/q1/118
- http://seclists.org/oss-sec/2017/q1/127
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10147
- https://nvd.nist.gov/vuln/detail/CVE-2016-10147
- https://security-tracker.debian.org/tracker/CVE-2016-10147
- https://ubuntu.com/security/CVE-2016-10147
- https://git.kernel.org/linus/48a992727d82cb7db076fa15d372178743b1f4cd
Frequently Asked Questions
What is the severity of CVE-2016-10147?
The severity of CVE-2016-10147 is medium.
How can local users exploit CVE-2016-10147?
Local users can exploit CVE-2016-10147 by using an AF_ALG socket with an incompatible algorithm, such as mcryptd(md5), to cause a denial of service.
Which versions of Linux are affected by CVE-2016-10147?
Linux kernel versions before 4.8.15 are affected by CVE-2016-10147.
How do I fix CVE-2016-10147?
To fix CVE-2016-10147, you should update your Linux kernel to version 4.8.15 or later.
Where can I find more information about CVE-2016-10147?
You can find more information about CVE-2016-10147 at the following references: [Reference 1](https://marc.info/?l=dm-devel&m=148063708010538&w=2), [Reference 2](http://marc.info/?l=linux-crypto-vger&m=148096718218312&w=2), [Reference 3](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=48a992727d82cb7db076fa15d372178743b1f4cd).
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